Brian Omwenga

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We describe the design, implementation, and evaluation of Tangaza, a mobile phone-based group messaging system targeted at moderately low-income users in developing regions. We focus on the design decisions that make Tangaza inexpensive and usable with even the most basic GSM mobile phone, and examine the resulting usability trade-offs. We also describe how(More)
We describe the Buzzenger project, a mobile phone based missed-call-duration interpretation project that makes use of a time-sliced messaging communication protocol useful for transmitting small data packets that can form complete messages at no cost. This project takes the basic beeping habits (missed calling/flashing) and extends them into a formalized(More)
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